Mix Test - 2...

The structure of bilobed anther consists of

The coconut water from tender coconut is

Pollen grains are well preserved as fossils because of presence of

Which of the following statements are correct with respect to hormones secreted by placenta?

(i) Placenta secretes relaxin during later stage of pregnancy.

(ii) Placenta secretes high amount of FSH during pregnancy.

(iii) Placenta secretes relaxin during initial stage of pregnancy.

(iv) Placenta secretes hCG and hPL during pregnancy

Penetration of the sperm in the ovum is followed by

The correct sequence of hormone secretion from beginning of menstruation is

The thalamus contributes to the fruit formation in

How many types of gametes would be produced if the genotype of a parent is AaBB?

Which of the following statements indicates parallelism in genes and chromosomes?

(i) They occur in pairs

(ii) They segregate during gamete formation

(iii) They show linkage

(iv) Independent pairs segregate independently

Which of the following amino acid substitution is responsible for causing sickle cell anemia?

In human beings, where genotype AABBCC represents dark skin colour, aabbcc represents light skin colour and AaBbCc represents intermediate skin colour; the pattern of genetic inheritance can be termed as:

Which of the following combination of chromosome numbers represents the correct sex determination pattern in honey bees?

Rajesh and Mahesh have defective haemoglobin due to genetic disorders. Rajesh has too few globin molecules while Mahesh has incorrectly functioning globin molecules. Identify the disorder they are suffering from.

Which of the following criteria must a molecule fulfil to act as a genetic material?

(i) It should not be able to generate its replica

(ii) It should chemically and structurally be stable

(iii) It should not allow slow mutation

(iv) It should be able to express itself in the form of Mendelian Characters

The promoter site and the terminator site for transcription are located at

Which of the following is correct about mature RNA in eukaryotes?

In E.coli, the lac operon gets switched on when

Oswald Avery, Colin MacLeod and Maclyn McCarty used enzymes to purify biochemicals such as proteins, DNA and RNA from the heat-killed S cells to see which ones could transform live R cells into S cells in Griffith's experiment. They observed that

Short stretches of DNA used to identify complementary sequence in a sample arecalled

Assertion: Lactational amenorrhea is the natural method of contraception.

Reason: It increases the phagocytosis of sperm.

Assertion: Saheli, an oral contraceptive for females, contains a steroidal preparation.

Reason: It is a "once a week" pill with very few side effects

Assertion: Parturition is induced by a complex neuro endocrine meachanism.

Reason: At the end of gestation period, the maternal pituitary releases prolactin which causes uterine contractions.

Assertion: When the two genes in a dihybrid cross are situated on the same chromosome, the proportion of parental gene combinations is much higher than nonparental type.

Reason: Higher parental gene combinations can be attributed to crossing over betweentwo genes.

In a fertilized ovule, n, 2n and 3n conditions occur respectively in